AHCCCS publishes their Medical Assisted Eligibility Policy Manual at: http://www.azahcccs.gov
The code of federal regulations is a great source and can be found here: https://www.ecfr.gov/current/title-38/chapter-I/part-3
The VA Knowledge Base is another great resource: https://www.knowva.ebenefits.va.gov/system/templates/selfservice/va_ssnew/help/customer/locale/en-US/portal/554400000001018